you dont give the techies anything to go on………..perhaps if you explain what is going on, or not, what electronic equipment you are using………and what does and doesn't work, then maybe you have a chance of getting an answer to what problems you havnt told us about.

domt forget photos of your set up………..nothing worse than trying to diagnose what is wrong if you cannot see what might be a simple problem to solve

Hi Matt and welcome to the forum. Unfortunately, as Neil has already indicated we are still very short of detail to be able to offer much in the way of constructive help.

However in very general terms motors tend to be fairly robust and rarely fail. Having said that brushed motors may eventually require attention to the brushes or commutators as dirt can build up and will affect performance. What is probably far more likely is the battery condition. If these are not kept fairly regularly cycled then they can deteriorate and cells can fail. Again we are a bit in the dark as we don't know what type of battery you have. The trouble is that it can be very difficult to identify a problem with the battery without a good charger. Simply charging it up and trying it tells you very little. If it is a lead acid type, which I am assuming it may be, then leaving it untouched for a long time will almost certainly lead to cell failure and a lack of ability to hold charge, Again you say you change the batteries but we don't know anything about them to be able to say.

You have also said nothing about the speed controller that is being used or the radio set up that is in the model, both of which may be potential sources of problem. The least likely to me would be the propeller because it used to work so why shouldn't it now, unless there is a chunk missing!

If it was me the first step would be to connect a known, good, charged battery directly across the motor terminals, with the motor disconnected from the propeller shaft, to see if the motor spins OK. If not maybe the brushes and commutator need a clean up. If it runs OK then the challenge is elsewhere. Does the propeller feel free when not connected to the motor etc.

Photos would still be very useful so please post them.

i still think it could partly to do with your shaft, and now having seen the photo of the motor ,coupling and shaft/tube………….there seems to be absolutely no play between motor and shaft, and when you open up on the throttle the thrust from the motor pushes forward and the far end of the coupling from the motor end then will bind on the prop tube causing friction and a binding of the motor/coupling and and shaft will slow the motor down with friction and increase amps used from your already dodgy batteries.

watch the couplings and see how they move .just click on to the photos until you find the video. this was the boat with rusted shafts.

Facebook

Edited By neil howard-pritchard on 22/08/2022 01:30:19

Click on the word "Facebook" in Neil's post.

Further to what Neil has said I notice that you haven't got an oiling tube on your shaft. If the tube has grease in and you are getting water ingress there is a very good chance the tube is full of solidified grease/muck/rust/water etc..etc.. Particularly if it has been sat there for six years with water in it.

I really think you should remove the motor, coupling and shaft, give everything a thorough clean up, re-oil or grease, I'm not a fan of grease in shafts but with your motor you should get away with it, and reassemble ensuring you have the play that Neil suggests.

Along with Neil I strongly suspect you will find a tight shaft.

Edited By Richard Simpson on 22/08/2022 08:18:15

You could make some washers out of a plastic milk carton (or buy some!) and use them either end of the shaft. You can then adjust the play for zero movement to help stop water coming in. Bottom will be water lubricatedand a drip of light oil inboard will keep them happy.

Ashley

Matt, The voltage of the battery dictates the speed at which the motor turns. A 12v battery will turn the motor twice as fast as a 6v battery will so operating your motor on 12v at half throttle or 6v at full throttle should, theoretically give you the same speed.

Current flow is a different thing. The battery holds charge, which is current waiting to flow. Connect it to a motor and the current flows out of the battery. The amount of current that the battery holds will determine how long the motor will run for before the current runs out. It does not determine how fast the motor spins it only determines how long it will spin for. The current required is dictated by how much work the motor is doing. A big motor driving a heavy load uses lots of current so drains the battery quicker.

A 14ah battery is only a measurement of current capacity. It will hold enough charge to supply 14 amps for 1 hour. It would also supply 28 amps for half an hour or 7 amps for 2 hours etc. To really understand your requirements you need to know what current your motor needs, which can only be determined by putting an ammeter in line with the motor when it is running under normal load. i.e. in water. Obviously not always the easiest thing to find out so that leaves experience and trial and error. If you fit a 7ah fully charged battery and run it for an hour at which point the motor dies, conveniently, then you know the motor has drawn 7 amps for that hour. Everything else is proportional. So a 14ah battery will last twice the length of time on the water as a 7ah one would, when running at the same speed.

I hope that helps.